Tax calculators

Tax calculators can be a useful tool for tax planning and cashflow forecasting. An income tax calculator, for example, can help you estimate future tax bills while a company car tax calculator can help you compare the tax impact of different company car choices.

The links below take you direct to the best calculators we've found online, many of which come from official sources such as HMRC and the Valuation Office and are continuously updated.

Income tax calculators and National Insurance payments

Income tax calculators aimed at employees can be used to calculate your own income tax if you are an employee of your own company, for example, and other employees’ income tax liabilities. Some income tax calculators also work out National Insurance contributions (NICs).

• This income tax calculator works out income tax and both the employer’s and employee NICs.
• This income tax calculator allows for a more detailed calculation including pension contributions.
• The HM Revenue & Customs (HMRC) tax checker for employees checks income tax due on savings interest as well as employment income but does not include NICs calculations.

You should not use the income tax calculators above to assess your tax liability if you are self-employed. A self-employment income tax calculator needs to take into account the different NICs paid and allowable business expenses.

The self-employed income tax calculator provides a simple calculation of income tax and Class 4 NICs. You can get a better picture of your future tax liabilities by completing your tax return online or taking advice from your accountant.

If you provide your services through a personal services company, you can assess the extra tax and NICs you may have to pay on dividend payments by downloading the HMRC IR35-deemed payment spreadsheet.

Company car tax calculators

The HMRC company car tax calculator includes company car tax and car fuel benefit for employees. You will need to complete details such as emissions and list price.

This company car tax calculator will automatically complete all the details if you choose the car model and provide comprehensive tax details for the next three years. This simpler company car tax calculator, also based on entering the car model, can be used to check current and historic tax details.

Corporation tax calculators

Corporation tax calculations are generally complex, relying on detailed information about income and expenses. Various online tax calculators can help with simple guidance and estimates:

• basic corporation tax calculator to assess liability based on profits
• HMRC marginal rate relief calculator for company profits between the small-profits rate threshold and the main corporation tax threshold
• HMRC R&D relief calculator to calculate your entitlement to corporation tax relief for research and development expenditure

For a fuller assessment of your tax liability and payment amounts, you should take advice.

Payroll calculators

HMRC provides a range of calculators you can use when managing payroll deductions:

• PAYE calculator for the tax to be deducted from an employee’s pay
• National Insurance calculator for employer’s and employee National Insurance contributions
• Directors annual NICs calculator for checking the final NICs payment for a director at the end of the tax year or when the directorship ends
• Statutory Sick Pay (SSP) calculator
• Statutory Maternity Pay (SMP) calculator
• Statutory Paternity Pay (SPP) calculator
• Statutory Paternity Pay (SPP) for adoptions calculator
• Statutory Adoption Pay (SAP) calculator

Other tax calculators

A simple VAT calculator can work out the amount of VAT you need to charge on standard-rated supplies.

This capital gains tax (CGT) calculator can help you estimate a potential CGT liability.

You can estimate your business rates liability on the Business Link website or assess any likely business rates transitional relief on the Canterbury City Council website.

You can use the HMRC stamp duty land tax (SDLT) calculators to work out how much SDLT might be payable on a property purchase.

As with all the other calculators listed, you may want to take advice to get a full picture of your tax liabilities and the opportunities to minimise tax.